linux-kernel - [PATCH v2] driver core: let dev_set_drvdata return int instead of void as it can fail

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1302547378-14639-1-git-send-email-u.kleine-koenig@pengutronix.de>
Date:	Mon, 11 Apr 2011 20:42:58 +0200
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	Greg KH <gregkh@...e.de>
Cc:	linux-kernel@...r.kernel.org, kernel@...gutronix.de,
	Viresh Kumar <viresh.kumar@...com>,
	linux-arm-kernel@...ts.infradead.org, shiraz.hashim@...com,
	Michał Mirosław <mirqus@...il.com>
Subject: [PATCH v2] driver core: let dev_set_drvdata return int instead of void as it can fail

Before commit

	b402843 (Driver core: move dev_get/set_drvdata to drivers/base/dd.c)

calling dev_set_drvdata with dev=NULL was an unchecked error. After some
discussion about what to return in this case removing the check (and so
producing a null pointer exception) seems fine.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
---
Hello,

@Viresh: as I didn't choose to return -EINVAL I didn't add your Reviewed-by:

Best regards
Uwe
 drivers/base/dd.c      |    7 +++----
 include/linux/device.h |    2 +-
 2 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index da57ee9..f9d69d7 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -408,17 +408,16 @@ void *dev_get_drvdata(const struct device *dev)
 }
 EXPORT_SYMBOL(dev_get_drvdata);
 
-void dev_set_drvdata(struct device *dev, void *data)
+int dev_set_drvdata(struct device *dev, void *data)
 {
 	int error;
 
-	if (!dev)
-		return;
 	if (!dev->p) {
 		error = device_private_init(dev);
 		if (error)
-			return;
+			return error;
 	}
 	dev->p->driver_data = data;
+	return 0;
 }
 EXPORT_SYMBOL(dev_set_drvdata);
diff --git a/include/linux/device.h b/include/linux/device.h
index ab8dfc0..e5e07eb 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -557,7 +557,7 @@ extern int device_move(struct device *dev, struct device *new_parent,
 extern const char *device_get_devnode(struct device *dev,
 				      mode_t *mode, const char **tmp);
 extern void *dev_get_drvdata(const struct device *dev);
-extern void dev_set_drvdata(struct device *dev, void *data);
+extern int dev_set_drvdata(struct device *dev, void *data);
 
 /*
  * Root device objects for grouping under /sys/devices
-- 
1.7.2.3

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/